V.23.0 : 'Delete new cookies when existing Opera'...?

Spent a lot of the past weekend on a spare WIN7 computer, trying to get 23.0 usable for us. It's still a struggle with the bookmark issue, but I never found a way to have OPERA 23.0 automatically [non-manually] delete new cookies...when I close it. Maybe I missed that ability?

Thanks for the reply. From my 'practice run' that feature cleans out ALL local data. There are three cookies I usually keep, and THEN click the 'Delete New Cookies...' box. Nice touch. An arm load of crap caught running around the 'Net, all gone in a flash. But not my "OLD" cookies!